Rotary disk bit



July 6, 1937. w. T. WOODS 2,086,486

ROTARY DISK BIT Filed Jul 6' 1935 www l3 11v VENTOR WALTER T. WOODS Bgm-ofil/ 1 94442256 ATTORNEY Patented July 6, 1937 1| STATES ROTARY DISKBIT Walter '1. Woods, Long Beach, Calif., assignor to Woodsco Tools,Ind, Long Beach, Calif., a corporation of California Application July26, 1935, Serial No. 33,217

9 Claims.

My invention relates to rotary disk bit, and has for its principalobjects the production of adequate support, both axial and lateral, forthe disk bearings, adapted to most efficiently distribute to the body ofthe bit the various stresses and strains communicated through the disksduring operation, and to provide a construction facilitating assemblagein which bearing surfaces may be easily replaced when worn, and in whichthe parts are held so securely in their assembled positions as toeliminate every reasonable possibility of loss in the hole.

Another important object is to provide hardfaced teeth for breaking downthe core between the disks, so disposed as to be easily built up andreconditioned when worn, which core-breaking teeth permit an adequateseparation of the disk-cutters to insure their sufficient rotation toconstantly present new cutting surfaces.

It is an object, also, to provide features of construction which willminimize danger of clogging of the disks by cuttings.

Still another object is to so form and dispose the circulating orificeas to most efficiently direct and distribute the mud fluid, as well asby its form to increase capacity.

Other objects and corresponding advantages will be apparent to all ofskill in the art to which this invention appertains in the light of thefollowing more detailed description.

In the drawing Figs. 1 and 2 are elevations of the bit;

Fig. 3 is a section on line 3-3 of Fig. 1;

Fig. 4 is a view in elevation of the bottom of the bit.

Referring to the drawing in detail, indicating numerals of which referto similar parts throughout the several views, 6 designates the. head ofthe bit, which is provided with a threaded box I at its upper end forattachment to the depending pin of a shank (not shown) which in turn issecured in the usual manner to a drill pipe (not shown), the lower partof said head 6 being centrally bifurcated vertically by slot 8 (Fig. 2),the

' two short legs formed thereby being in turn similarly bifurcated so asto form two outer legs 9 and It and two inner legs II and i2.

Each pair of legs, consisting of an outer and an inner member, is boredtransversely adjacent its lower end to a diameter to receive the shanksof respective disk pins l3 and is also counterbored (Fig. 3) tocountersink heads 13a and nuts i311 (said nuts being preferably weldedin their respective counterbores) of said respective disk pins, saidbores being axially in the same horizontal plane and parallel both witheach other and with chords of a circle representing a cross-sectionalarea of the upper part of head 6, thus to provide for the support ofaxial bearings of the disks later to be described which will be offsetfrom each other as most clearly shown in' Figs. 1 and 4.

Bevelling of faces Hi and I5 (as shown in Fig. l) of respectiveadjoining pairs of legs, results in the substantial centralization ofsaid disk pin bores each with respect to the lower ends of itsrespective pair of legs.

Bearing bushing it, having an integral thrust flange or collar 18a, whenassembled with thrust washer 11 forms an easily replaceable spoolbearing upon which disks I8 are respectively rotatably mounted (as mostclearly shown in Fig. 3).

Cap screws 19 threaded into, with their heads counter-sunk in each ofouter legs 9 and I0 adjacent the peripheries of disk-pin heads Not so asto optionally engage any of a series of arcuate notches 20 in theperipheries of said disk-pin heads, form a means for securely lockingdiskpins E3 in their assembled operative positions.

Inner legs H and I2 are each provided with downwardly extending hardenedteeth 21 and 22, each designed to out in the direction of revolution ofthe bit to break down and cut away any core left by the disk-cutters.

An orifice 23 for circulating fluid is centrally disposed between thecutters, and is of rectangular form. Owing to the shallowness of thebifurcation separating inner legs II and i2 and the rectangularcross-sectional contour of said orifice, circulating fluid is directedand distributed closely adjacent to the cutting edges.

What I claim and desire to cover by Letters Patent is:

1. In a device of the character described, a bit head verticallyfurcated to form two pairs of spaced-apart legs, a pair of disks, anaxial bearing for each of said disks carried by said legs in off-setrelation to each other and in the same horizontal plane, and a toothadjacent said disks having its cutting edge perpendicular to the planeof said disks.

2. In a device of the character described, a bit head having its lowerportion furcated to form two pairs of spaced-apart legs, the twoinnermost of said legs carrying depending cutter blades, a pair ofdisks, axial bearings for said disks each carried between said legsoff-set from each other and in the same horizontal plane.

3. In a device of the character described. a forked bit head, a pair ofdisks pivoted in different furcations of said head, a longitudinallydisposed circulation passage through said bit head having an orificebetween said disks, and teeth on the lower end of the inner furcationsof said bit head.

4. In a device of the character described, a bit head divided into aplurality of furcations, a central passage through said head, a tooth oneach side of the orifice of said passage, and a pair ofvertically-disposed disks rotatably secured at right angles to thecutting edge of said tooth between two of said furcations of said head.

5. In a device of the character described, a forked bit head, a pair ofdisks, two pins for axial rotatable support of said disks in differentfurcations of said bit head, and on opposite sides of the plane throughthe vertical axis of the head which is perpendicular to said pins, acentral passage through the bit head having an orifice between saiddisks, and non-rotatable teeth secured to said bit head having theircutting edges disposed in a horizontal plane intermediate the body ofthe bit and the lowest cutting edges of said disks.

tooth having its cutting edge in a higher horizontal plane than thelower edges of said disks.

'7. In a device of the character described, a bit head having its lowerportion furcated to form two pairs of spaced-apart legs, the twoinnermost of said legs carrying depending cutter blades, 2. pair ofdisks, each with both-of its radial surfaces convex, axial bearings forsaid disks each carried between said legs off-set from each other and inthe same horizontal plane.

8. In a disk bit, a forked bit head, a pair of disks each with itsradial surfaces convex pivoted in different furcations of said head, alongitudinally disposed circulation passage through said bit head havingan orifice between said disks, and a non-rotatable cutting tooth carriedby one of said furcations.

9. In a disk bit, a forked bit head, a pair of disks with verticalplanes through their centers

